docs: def filters(im, detail=False, sharpen=False, **kwargs):
      """
      Pass the source image through post-processing filters.
  
      sharpen
          Sharpen the thumbnail image (using the PIL sharpen filter)
  
      detail
          Add detail to the image, like a mild *sharpen* (using the PIL
          ``detail`` filter).
  
      """
      if detail:
          im = im.filter(ImageFilter.DETAIL)
      if sharpen:
          im = im.filter(ImageFilter.SHARPEN)
      return im